IS 11021 : 2004 Methods for Determination of Dimethoate Residues in Food Commodities

1 Scope

1.1 This standard prescribes spectrophotometric and gas chromatographicmethods for the determination of dimethoate [O,O-dimethyl-S-(N-methylcarbamoyl methyl) phosphorodithioate] residues in foods.

1.1.1 The spectrophotometric method may be adopted as a limit test forroutine purposes and is generally applicable at 0.1 μg/g (0.1 ppm) residuelevel, whereas, gas chromatographic method shall be the reference methodwith the limit of detection of 0.02 to 0.01 μg/g (0.02-0.01 ppm).

1.1.2 Though no set procedure for thin layer chromatography (TLC) is beingprescribed, standardized TLC procedures may be followed, if necessary forthe purpose of clean up, identification and confirmation of dimethoateresidues.

2 References

IS 1070 : 1992 Reagent grade water

IS 11380 : Part 1 : 1985 Methods of sampling for determination of pesticides residues: Part 1 Agricultural and food commodities